EP0435278A3 - Bias magnetic field generating apparatus - Google Patents

Bias magnetic field generating apparatus Download PDF

Info

Publication number
EP0435278A3
EP0435278A3 EP19900125553 EP90125553A EP0435278A3 EP 0435278 A3 EP0435278 A3 EP 0435278A3 EP 19900125553 EP19900125553 EP 19900125553 EP 90125553 A EP90125553 A EP 90125553A EP 0435278 A3 EP0435278 A3 EP 0435278A3
Authority
EP
European Patent Office
Prior art keywords
magnetic field
generating apparatus
field generating
bias magnetic
bias
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19900125553
Other versions
EP0435278A2 (en
EP0435278B1 (en
Inventor
Ichiro Kawamura
Goro Naoki
Yukinori Okazaki
Ryoichi Imanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP89342677A external-priority patent/JPH03203002A/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0435278A2 publication Critical patent/EP0435278A2/en
Publication of EP0435278A3 publication Critical patent/EP0435278A3/en
Application granted granted Critical
Publication of EP0435278B1 publication Critical patent/EP0435278B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
    • G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10556—Disposition or mounting of transducers relative to record carriers with provision for moving or switching or masking the transducers in or out of their operative position
    • G11B11/1056—Switching or mechanically reversing the magnetic field generator
EP90125553A 1989-12-28 1990-12-27 Bias magnetic field generating apparatus Expired - Lifetime EP0435278B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP89342677A JPH03203002A (en) 1989-12-28 1989-12-28 Bias matnetic field inverter
JP342677/89 1989-12-29
JP332356/90 1990-11-28
JP33235690 1990-11-28

Publications (3)

Publication Number Publication Date
EP0435278A2 EP0435278A2 (en) 1991-07-03
EP0435278A3 true EP0435278A3 (en) 1992-09-02
EP0435278B1 EP0435278B1 (en) 1996-07-10

Family

ID=26574170

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125553A Expired - Lifetime EP0435278B1 (en) 1989-12-28 1990-12-27 Bias magnetic field generating apparatus

Country Status (5)

Country Link
US (1) US5229983A (en)
EP (1) EP0435278B1 (en)
KR (1) KR940001453B1 (en)
CA (1) CA2033275C (en)
DE (1) DE69027754T2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5570329A (en) * 1995-03-31 1996-10-29 Eastman Kodak Company System for selectively inverting a magnetic bias field for magneto-optic recording
US6570724B1 (en) * 1999-04-26 2003-05-27 Fuji Photo Film Co., Ltd. Method and apparatus for magnetic transfer
JP4046480B2 (en) * 2001-02-23 2008-02-13 富士フイルム株式会社 Magnetic transfer method and magnetic transfer apparatus
WO2018182203A1 (en) * 2017-03-30 2018-10-04 엘지이노텍 주식회사 Lens driving device and camera module

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0222916A1 (en) * 1985-04-29 1987-05-27 Sony Corporation External magnetic field reversing apparatus for photomagnetic disks
US4701895A (en) * 1986-03-28 1987-10-20 Rca Corporation Magnetic biasing apparatus for magneto-optic recording including a permanent magnet
EP0290281A2 (en) * 1987-05-08 1988-11-09 Sharp Kabushiki Kaisha Apparatus for giving auxiliary magnetic field
US4962492A (en) * 1988-04-29 1990-10-09 Laser Magnetic Storage International Company Magneto-optic data recording system, actuating device therefor and method of providing same

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5724047A (en) * 1980-07-21 1982-02-08 Matsushita Electric Ind Co Ltd Recorder and reproducer
GB2083677B (en) * 1980-07-16 1985-01-23 Matsushita Electric Ind Co Ltd Magnetooptical recording medium and a magnetooptical recording-and reeproducing device
JPH0636241B2 (en) * 1982-09-21 1994-05-11 シャープ株式会社 Thermomagnetic recording device
JPS5992406A (en) * 1982-11-17 1984-05-28 Matsushita Electric Ind Co Ltd Photo-magnetic recorder
JPS59146408A (en) * 1983-02-09 1984-08-22 Matsushita Electric Ind Co Ltd Impressing device of record erasing magnetic field for photomagnetic recording medium
JPS60226044A (en) * 1984-04-24 1985-11-11 Sony Corp Optomagnetic recording device
JPH07105085B2 (en) * 1986-07-30 1995-11-13 株式会社日立製作所 Magneto-optical disk device
JPH0727606B2 (en) * 1986-12-11 1995-03-29 ソニー株式会社 Magnetic field application device for recordable optical disk
JPH0633526Y2 (en) * 1988-11-10 1994-08-31 ティアツク株式会社 Magneto-optical disk device
JPH0636481Y2 (en) * 1989-02-13 1994-09-21 ティアツク株式会社 Bias magnetic field applying device for magneto-optical disk device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0222916A1 (en) * 1985-04-29 1987-05-27 Sony Corporation External magnetic field reversing apparatus for photomagnetic disks
US4701895A (en) * 1986-03-28 1987-10-20 Rca Corporation Magnetic biasing apparatus for magneto-optic recording including a permanent magnet
EP0290281A2 (en) * 1987-05-08 1988-11-09 Sharp Kabushiki Kaisha Apparatus for giving auxiliary magnetic field
US4962492A (en) * 1988-04-29 1990-10-09 Laser Magnetic Storage International Company Magneto-optic data recording system, actuating device therefor and method of providing same

Also Published As

Publication number Publication date
CA2033275C (en) 1994-10-25
DE69027754D1 (en) 1996-08-14
US5229983A (en) 1993-07-20
EP0435278A2 (en) 1991-07-03
CA2033275A1 (en) 1991-06-29
KR910013117A (en) 1991-07-31
KR940001453B1 (en) 1994-02-23
EP0435278B1 (en) 1996-07-10
DE69027754T2 (en) 1996-12-05

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